A separation method is proposed to design and improve shock absorber according to the characteristics of each force. The method is validated by rig test. The force data measured during rig test is the resultant force ...A separation method is proposed to design and improve shock absorber according to the characteristics of each force. The method is validated by rig test. The force data measured during rig test is the resultant force of damping force, rebound force produced by pressed air, and friction force. Different characters of damping force, air rebound force and friction force can be applied to seperate each force from others. A massive produced air filling shock absorber is adopted for the validation. The statistic test is used to get the displacement-force curves. The data are used as the input of separation calculation. Then the tests are carried out again to obtain the force data without air rebound force. The force without air rebound is compared to the data derived from the former tests with the separation method. The result shows that this method can separate the damping force and the air elastic force.展开更多
根据多连杆压力机的行程曲线特点,提出了以80%公称力作为公称力控制线,并据此绘制压力机载荷许用区间图,即将力-行程曲线划分为安全区、临界区和危险区。当成形力处于公称力控制线下方,则设备载荷能够满足成形要求;当成形力处于公称力...根据多连杆压力机的行程曲线特点,提出了以80%公称力作为公称力控制线,并据此绘制压力机载荷许用区间图,即将力-行程曲线划分为安全区、临界区和危险区。当成形力处于公称力控制线下方,则设备载荷能够满足成形要求;当成形力处于公称力控制线和公称力曲线之间的临界区,需要进一步对变形功进行校核。另一方面,采用数值积分的方法对成形力和作用距离进行积分,得到变形功,与压力机许用变形功进行比较,提出能量校核的前提和校核方法。最后提出了成形力和变形功校核流程图,并用于前门内板等零件的分析。结果表明,采用22500 k N压力机满足前门内板一模双件载荷要求。展开更多
文摘A separation method is proposed to design and improve shock absorber according to the characteristics of each force. The method is validated by rig test. The force data measured during rig test is the resultant force of damping force, rebound force produced by pressed air, and friction force. Different characters of damping force, air rebound force and friction force can be applied to seperate each force from others. A massive produced air filling shock absorber is adopted for the validation. The statistic test is used to get the displacement-force curves. The data are used as the input of separation calculation. Then the tests are carried out again to obtain the force data without air rebound force. The force without air rebound is compared to the data derived from the former tests with the separation method. The result shows that this method can separate the damping force and the air elastic force.
文摘根据多连杆压力机的行程曲线特点,提出了以80%公称力作为公称力控制线,并据此绘制压力机载荷许用区间图,即将力-行程曲线划分为安全区、临界区和危险区。当成形力处于公称力控制线下方,则设备载荷能够满足成形要求;当成形力处于公称力控制线和公称力曲线之间的临界区,需要进一步对变形功进行校核。另一方面,采用数值积分的方法对成形力和作用距离进行积分,得到变形功,与压力机许用变形功进行比较,提出能量校核的前提和校核方法。最后提出了成形力和变形功校核流程图,并用于前门内板等零件的分析。结果表明,采用22500 k N压力机满足前门内板一模双件载荷要求。
